The format used by iPhone Voice Memos and most call recorders. Upload it directly, without converting it to MP3 first.
M4A is the format generated by iPhone Voice Memos, recordings made on a Mac, and most Android call recorders. Internally it's an MP4 container with AAC audio, and it's one of the most common formats when transcribing.
We read it directly, at whatever bitrate and sample rate your device recorded, with no need to convert it first.
Share it from your phone or drag it in from your computer.
Detecting the language automatically and separating voices when there's more than one.
DOCX, PDF, SRT, CSV or JSON, including your corrections.
An idea, interview or lesson recorded in the Voice Memos app.
Most recorders generate M4A. It's processed directly.
Up to two hours in a single file, with timestamps to locate any moment.
Recording a voice memo on an iPhone produces an M4A file, as does most recording software on Android. It's the standard format for AAC audio, the codec phones use because, at the same file size, it offers better quality than an MP3.
You can upload it as is: there's no need to convert it to MP3 or change its extension. Converting it would only reduce quality, since any additional compression works on the result of the previous one.
Call-recording apps usually produce M4A, with one particularity: each side of the conversation can arrive at a very different volume. If you can choose, record with speakerphone on and the phone placed on a table; the signal is slightly worse but more even, improving speaker identification.
In a field interview, microphone proximity has the biggest impact on the result. An M4A recorded thirty centimetres away comes out clean; the same file recorded from across the table picks up the entire surrounding noise, which ends up as incorrect text.
Upload it and get the text with timestamps, each voice identified and a summary. No account needed to start.